Lesson 4 of 8 · Grade 1 and 2
Tens and ones to 100
The same tens and ones idea builds every number to 99. 10 tens make 100.
Step 1
Learn it
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Up to nine tens
In 76, there are 7 tens and 6 ones.
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The biggest
99 is 9 tens and 9 ones. One more makes 10 tens.
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100
10 tens make 100. The number has three digits.
Step 2
Watch how
Two examples, worked out one step at a time.
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How many are shown?
5 tens is 50. 8 ones is 8. 50 + 8 = 58.
Answer: 58 -
How many tens make 100?
Count by tens: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100. That is 10 tens.
Answer: 10
Step 3
Play with it
Add ones. Snap ten ones into one ten.
Step 4
Practice
Five questions. Think first. Then tap Show answer.
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6 tens and 3 ones is what number?
Show answer
63
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8 tens and 0 ones is what number?
Show answer
80
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How many tens are in 94?
Show answer
9
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70 + 5 = ?
Show answer
75
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99 and one more is what number?
Show answer
100